Effect of oxygen on the diffusion of Ni in Pt in Pt-Ni-Pt films

We have studied the effect of oxygen on the diffusion of Ni into Pt in the Pt-Ni-Pt films. Below 400°C, the diffusion rates of Ni into both Pt layers are greatly reduced by oxygen. Above 500°C, however, Ni rapidly mixes with Pt layers, which leads to the formation of Ni oxide on the Pt surface in the presence of oxygen.